A particular chemical reaction carried out at 20oC takes 2 hours. How long will it take to carry out the react

reaction at 40oC?

0.5 hour
1 hour
4 hours
8 hours

Answer:
For every 10oC increase the rate doubles, or the time gets halved. So the increase is 2x10oC, the time gets halved twice: 2hr/2/2=0.5hr.

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